Cathay Pacific Air says data breach affected 9.4 million

, FILE - In this Aug. 16, 2017, file photo, Cathay Pacific Chairman John Slosar attends a news conference as he announces the company result in Hong Kong, Wednesday, Aug. 16, 2017. Hong Kong-based Cathay Pacific Airways says it has discovered unauthorized access to the personal data of 9.4 million passengers. The company said Thursday, Oct. 25, 2018 it had no evidence the leaked data had been misused. (AP Photo/Vincent Yu, File)

HONG KONG (AP) — Hong Kong-based Cathay Pacific Airways said Thursday it has discovered unauthorized access to the personal data of 9.4 million passengers but had no evidence the leaked information had been misused.

The breach was discovered during "ongoing security processes," the airline said in a statement.

He said his office would begin a compliance check of the airline. He urged people to change their passwords and enable "two-factor authentication," to help protect their data.

The news caused the airline's shares to plunge 6.5 percent in early Hong Kong trading. By midday Thursday, Cathay Pacific's shares were down 5.1 percent.

Cathay Pacific said the data stolen included names, nationalities; birth dates, phone numbers, addresses, passport and identity card numbers and expired credit card numbers, among other information. It said no passwords were compromised. It was contacting customers to advise them on how to protect themselves.

It also said customers could contact the airline at infosecurity@cathaypacific.com.

"We are very sorry for any concern this data security event may cause our passengers. We acted immediately to contain the event, commence a thorough investigation with the assistance of a leading cybersecurity firm, and to further strengthen our IT security measures," the airline's CEO, Rupert Hogg said in a statement.